66217147127 has 4 divisors (see below), whose sum is σ = 66494206560. Its totient is φ = 65940087696.

The previous prime is 66217147123. The next prime is 66217147141. The reversal of 66217147127 is 72174171266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66217147127 - 2² = 66217147123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66217147123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138529358 + ... + 138529835.

It is an arithmetic number, because the mean of its divisors is an integer number (16623551640).

Almost surely, 2^66217147127 is an apocalyptic number.

66217147127 is a deficient number, since it is larger than the sum of its proper divisors (277059433).

66217147127 is a wasteful number, since it uses less digits than its factorization.

66217147127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277059432.

The product of its digits is 197568, while the sum is 44.

The spelling of 66217147127 in words is "sixty-six billion, two hundred seventeen million, one hundred forty-seven thousand, one hundred twenty-seven".